Go to Admin → Integrations → Files and click Connect Google Drive. Log in with the Google account where your client files live and authorize Senly.
After authorization, choose a "Clients" root folder — for example, the folder where you have a subfolder per client. Senly automatically matches existing client folders by name with your clients in the portal.
Does a client not have a subfolder yet? With Create client folder in the client profile, Senly creates the folder automatically under your chosen "Clients" root.